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Added example where Strategy=>Unmixed can be faster than Strategy=>De… #4

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9 changes: 9 additions & 0 deletions M2/Macaulay2/packages/MinimalPrimes/doc.m2
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Expand Up @@ -234,6 +234,15 @@ Node
I = intersect(ideal(a^2,b^2,c), ideal(a,b^3,c^2))
elapsedTime radical(ideal I_*, Strategy => Monomial)
elapsedTime radical(ideal I_*, Unmixed => true)
Text
Sometimes when it is computationally expensive to compute the set of minimal primes of an
ideal the strategy Unmixed can be useful for computing the radical as it does so without
computing the set of minimal primes. The example below demonstrates one such instance.
Example
R = QQ[x,y]
I = ideal(x^250 - y^250)
elapsedTime radical(ideal I_*, Strategy => Decompose)
elapsedTime radical(ideal I_*, Strategy => Unmixed)
Text
For another example, see @TO "PrimaryDecomposition :: PrimaryDecomposition"@.
References
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